<template>
  <div>
    <nav-bar>
      <div slot="left" @click="backClick"><i class="el-icon-back"></i></div>
      <div slot="center" class="title">
        <div v-for="(item,index) in titles" :key="index" class="title-item" @click="itemClick(index)" :class="{isActive: index == currentIndex}">
          {{item}}
        </div>
      </div>
    </nav-bar>  
  </div>
</template>

<script>

import NavBar from "@/components/common/NavBar"

export default {
  name:"DetailNavBar",
  components: {
    NavBar
  },
  data(){
    return{
      titles:["商品","参数","评论","推荐"],
      currentIndex: 0
    }
  },
  methods: {
    itemClick(index){
      this.currentIndex = index;
      this.$emit('titleClick',index);
    },
    backClick(){
      this.$router.go(-1)
    }
  }
}
</script>

<style scoped>

.title{
  display: flex;
  font-size: 13px;
}

.title-item{
  flex: 1;
}

.isActive{
  color: red;
}

</style>